to dry in anything as little as 5 minutes, but this is usually referring to putting it on your walls ??? so on foam it takes much longer, so place it in a warm well ventilated place to speed up drying.When applying the filler with a spatula or a tongue-depressor, try to follow the same grooves you created with the files and other tools, as this gives a more even surface.Step #11: Smoothing.PrevNex